facebookexternalhit — What It Is and How to Handle It

facebookexternalhit fetches URL metadata (Open Graph tags) to generate rich link previews when users share links on Facebook, Instagram, and Messenger.

Operator: Meta | Type: Feed Reader | Category: Feed Reader

facebookexternalhit is classified as feed reader. Use Centinel to monitor its behavior and decide whether to allow, block, challenge, or monetize its access to your content.

Centinel automatically detects facebookexternalhit using behavioral fingerprinting. When detected, you can allow it, block it, challenge it with an interstitial page, or set a per-request licensing fee — all enforced in real-time with under 2ms latency.